The most vicious and insane populations of bull sharks from Australia and America faceoff in a no-holds-barred showdown beneath the water. Bull Shark-attack survivor Paul de Gelder contends that his Aussie sharks are the toughest, while American shark biologist Dr. Craig O'Connell attempts to find the meanest sharks Florida has to offer to take the crown.

A rogue Tiger Shark attacks and kills a person in St. Martin. Weeks later, it strikes again. Locals fear it could be the work of the legendary Devil Shark – a massive and ruthless tiger shark who's haunted their shores for decades. When a team sets out to track down the shark responsible for the attacks, they uncover a seismic force that may be triggering aggression in sharks.

Off Mozambique's coast, sharks swarm a hidden peak, hunting Giant Trevally in a once-a-year feeding frenzy. But when 5,000 Trevally fight back, the hunters become the hunted in one of the ocean's wildest showdowns.